am43xx_evm: add usb host boot support

While booting via usb host mode, ROM uses DMA to copy MLO over USB so ARM internal RAM cannot be used. Adding USB host boot support by introducing new config target which sets SPL_TEXT_BASE to OCMC ram. Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>

am43xx_evm: add usb host boot support
While booting via usb host mode, ROM uses DMA to copy MLO over USB so ARM internal RAM cannot be used. Adding USB host boot support by introducing new config target which sets SPL_TEXT_BASE to OCMC ram. Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com> Reviewed-by: Tom Rini <trini@konsulko.com>
Mugunthan V N · Tom Rini · Eric Lee · Eric Lee · Eric Lee · Eric Lee
1 parent 46a14a6383
Showing 2 changed files with 16 additions and 1 deletions Side-by-side Diff
configs/am43xx_evm_usbhost_boot_defconfig
include/configs/am43xx_evm.h
+CONFIG_ARM=y
+CONFIG_TARGET_AM43XX_EVM=y
+CONFIG_SPL=y
+CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1,NAND,SPL_USB_HOST_SUPPORT"
+CONFIG_CMD_NET=y
@@ -42,7 +42,16 @@
 #define CONFIG_POWER_TPS62362
  
 /* SPL defines. */
+#ifdef CONFIG_SPL_USB_HOST_SUPPORT
+/*
+ * For USB host boot, ROM uses DMA for copying MLO from USB storage
+ * and ARM internal ram is not accessible for DMA, so SPL text base
+ * should be in OCMC ram
+ */
+#define CONFIG_SPL_TEXT_BASE		0x40300350
+#else
 #define CONFIG_SPL_TEXT_BASE		0x402F4000
+#endif
 #define CONFIG_SPL_MAX_SIZE		(220 << 10)	/* 220KB */
 #define CONFIG_SYS_SPL_ARGS_ADDR	(CONFIG_SYS_SDRAM_BASE + \
 					 (128 << 20))
  
@@ -95,8 +104,8 @@
 #define CONFIG_SPL_LDSCRIPT		"$(CPUDIR)/omap-common/u-boot-spl.lds"
  
 /* SPL USB Support */
+#ifdef CONFIG_SPL_USB_HOST_SUPPORT
 #define CONFIG_SPL_USB_SUPPORT
-#define CONFIG_SPL_USB_HOST_SUPPORT
 #define CONFIG_SYS_USB_FAT_BOOT_PARTITION		1
  
 #define CONFIG_CMD_USB
@@ -108,6 +117,7 @@
  
 #define CONFIG_OMAP_USB_PHY
 #define CONFIG_AM437X_USB2PHY2_HOST
+#endif
  
 /* USB GADGET */
 #if !defined(CONFIG_SPL_BUILD) || \
	1	+CONFIG_ARM=y
	2	+CONFIG_TARGET_AM43XX_EVM=y
	3	+CONFIG_SPL=y
	4	+CONFIG_SYS_EXTRA_OPTIONS="SERIAL1,CONS_INDEX=1,NAND,SPL_USB_HOST_SUPPORT"
	5	+CONFIG_CMD_NET=y
...	...	@@ -42,7 +42,16 @@
42	42	#define CONFIG_POWER_TPS62362
43	43
44	44	/* SPL defines. */
	45	+#ifdef CONFIG_SPL_USB_HOST_SUPPORT
	46	+/*
	47	+ * For USB host boot, ROM uses DMA for copying MLO from USB storage
	48	+ * and ARM internal ram is not accessible for DMA, so SPL text base
	49	+ * should be in OCMC ram
	50	+ */
	51	+#define CONFIG_SPL_TEXT_BASE 0x40300350
	52	+#else
45	53	#define CONFIG_SPL_TEXT_BASE 0x402F4000
	54	+#endif
46	55	#define CONFIG_SPL_MAX_SIZE (220 << 10) /* 220KB */
47	56	#define CONFIG_SYS_SPL_ARGS_ADDR (CONFIG_SYS_SDRAM_BASE + \
48	57	(128 << 20))
49	58
...	...	@@ -95,8 +104,8 @@
95	104	#define CONFIG_SPL_LDSCRIPT "$(CPUDIR)/omap-common/u-boot-spl.lds"
96	105
97	106	/* SPL USB Support */
	107	+#ifdef CONFIG_SPL_USB_HOST_SUPPORT
98	108	#define CONFIG_SPL_USB_SUPPORT
99		-#define CONFIG_SPL_USB_HOST_SUPPORT
100	109	#define CONFIG_SYS_USB_FAT_BOOT_PARTITION 1
101	110
102	111	#define CONFIG_CMD_USB
...	...	@@ -108,6 +117,7 @@
108	117
109	118	#define CONFIG_OMAP_USB_PHY
110	119	#define CONFIG_AM437X_USB2PHY2_HOST
	120	+#endif
111	121
112	122	/* USB GADGET */
113	123	#if !defined(CONFIG_SPL_BUILD) \|\| \